WO2013118298A1 - 作動流体供給装置及び流体供給システム - Google Patents
作動流体供給装置及び流体供給システム Download PDFInfo
- Publication number
- WO2013118298A1 WO2013118298A1 PCT/JP2012/053137 JP2012053137W WO2013118298A1 WO 2013118298 A1 WO2013118298 A1 WO 2013118298A1 JP 2012053137 W JP2012053137 W JP 2012053137W WO 2013118298 A1 WO2013118298 A1 WO 2013118298A1
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- WIPO (PCT)
- Prior art keywords
- piston
- working fluid
- storage chamber
- fluid supply
- fuel
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M49/00—Fuel-injection apparatus in which injection pumps are driven or injectors are actuated, by the pressure in engine working cylinders, or by impact of engine working piston
- F02M49/02—Fuel-injection apparatus in which injection pumps are driven or injectors are actuated, by the pressure in engine working cylinders, or by impact of engine working piston using the cylinder pressure, e.g. compression end pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34446—Fluid accumulators for the feeding circuit
Definitions
- the present invention relates to a working fluid supply device for supplying a working fluid to an external device.
- the present invention also relates to a fluid supply system including a working fluid supply device, and more particularly to a fluid supply system for supplying a working fluid as fuel to an injector that injects fuel into a cylinder of a diesel engine. .
- a system described in Patent Document 1 has been proposed as a fluid supply system for supplying fuel to a marine diesel engine.
- a fluid supply system includes a first working fluid supply device 202 and a second working fluid supply device 205 as shown in FIG.
- the first working fluid supply device 202 supplies fuel to an injector (external device) 201 that injects fuel into the cylinder 200 of the diesel engine.
- the second working fluid supply device 205 supplies the working fluid to an exhaust valve driving unit (external device) 204 that opens and closes an exhaust valve 203 used for exhausting in the cylinder 200.
- the gas in the cylinder 200 is adiabatically compressed by the rise of the piston 206 located in the cylinder 200 and becomes high temperature.
- the injector 201 injects the fuel supplied by the first working fluid supply device 202 into the cylinder 200.
- the piston 206 is pushed down.
- the working fluid is supplied from the second working fluid supply device 205 and the exhaust valve driving unit 204 is driven to open the exhaust valve 203. Then, exhaust in the cylinder 200 is started.
- the diesel engine has a plurality of cylinders 200.
- One working fluid supply device 202, 205 is provided for each cylinder 200. Therefore, the larger the number of cylinders 200 constituting the diesel engine, the larger the fluid supply system including the respective working fluid supply devices 202 and 205.
- An object of the present invention is to provide a working fluid supply device and a fluid supply system that can individually supply working fluid to a plurality of external devices.
- a main body having a storage chamber and a second chamber that is disposed in the storage chamber and moves in a first direction or a second direction that is opposite to the first direction.
- a working fluid supply device that includes a first piston that moves in a second direction with respect to the first piston and moves in the first or second direction in the housing chamber.
- the main body is provided with a first opening and a second opening.
- the first piston moves in the first direction in a state where the working fluid is stored at the end in the first direction in the storage chamber. Then, the working fluid stored in the end portion in the first direction in the storage chamber is pushed out by the first piston and flows out of the storage chamber from the first opening. Then, the working fluid flowing out from the first opening is supplied to the first external device. Thereby, the first external device can be driven.
- the second piston is moved in the second direction while the working fluid is stored at the end in the second direction in the storage chamber. Then, the working fluid stored in the end portion in the second direction in the storage chamber is pushed out by the second piston and flows out of the storage chamber from the second opening. Then, the working fluid flowing out from the second opening is supplied to the second external device. Thereby, the second external device can be driven. Therefore, the working fluid can be individually supplied to a plurality of external devices.
- the storage chamber is partitioned into a first space located on the first direction side and a second space located on the second direction side, and the first or first of the first space is divided.
- the cross-sectional area along the two directions is preferably smaller than the cross-sectional area along the first or second direction of the second space.
- the end portion on the first direction side of the first piston is located in the first space of the accommodation chamber, and the end portion on the second direction side of the first piston is the accommodation chamber.
- the surface area of the end portion on the first direction side of the first piston is preferably smaller than the surface area of the end portion on the second direction side of the second piston.
- the first external device is moved along with the movement of the first piston by moving the second piston in the first direction and pushing the first piston in the first direction by the second piston.
- the pressure of the working fluid supplied to the can be increased. That is, the working fluid supplied to the end portion in the first direction in the housing chamber can be sent out toward the first external device in a state adjusted to a high pressure.
- a biasing member that biases the second piston in the first direction.
- the urging force from the urging member can be used.
- the first direction end and the second direction end of the first piston are located in the first space of the storage chamber, and the second piston has a second end.
- the end portion on the one-direction side is located in the first space of the storage chamber
- the end portion on the second direction side of the second piston is located in the second space of the storage chamber
- the second The surface area of the end portion on the second direction side of the piston is preferably larger than the surface area of the end portion on the first direction side of the second piston.
- the fluid pressure of the working fluid supplied to the second external device along with the movement of the second piston can be lowered. That is, the working fluid supplied to the end portion in the second direction in the storage chamber can be sent out to the first external device in a decompressed state.
- a first urging member that urges the second piston in the first direction a second urging member that urges the second piston in the second direction
- the urging force that the second urging member applies to the second piston is preferably weaker than the urging force that the first urging member applies to the second piston.
- the urging force from the first urging member and the second urging member can be used when the second piston is moved in the first direction and the second direction.
- a fluid supply system for supplying a working fluid as a fuel into a cylinder of a diesel engine.
- the fluid supply system includes the above-described working fluid supply device, a first flow path for guiding the working fluid that has flowed out of the storage chamber through the first opening to the injector that injects fuel into the cylinder, and the cylinder.
- a control device for controlling the movement of the piston.
- the control device When injecting the working fluid from the injector into the cylinder as the working fluid, the control device supplies the working fluid to the end portion in the first direction in the housing chamber, then moves the second piston in the first direction, In the case of opening, the second piston is moved in the second direction in a state where the working fluid is stored at the end in the second direction in the storage chamber.
- the first piston when the second piston is moved in the first direction after the working fluid is supplied to the end portion on the first direction side in the storage chamber, the first piston is moved by the second piston. Pushed in the first direction and moved in the first direction. Then, the working fluid at the end in the first direction in the storage chamber is pushed out by the first piston and flows out of the storage chamber from the first opening. At this time, the working fluid that has flowed out of the first opening is adjusted to a high pressure from the pressure when the working fluid is supplied into the storage chamber. Then, such working fluid is supplied to the injector through the first flow path, and this injector injects the supplied working fluid into the cylinder of the diesel engine as fuel.
- the working fluid at the second direction end in the accommodation chamber is changed. Then, it is pushed out by the second piston and flows out of the storage chamber through the second opening.
- Such a working fluid is supplied to the exhaust valve driving unit via the second flow path.
- the exhaust valve driving unit opens the exhaust valve when the working fluid is supplied.
- both supply of fuel to the injector and opening and closing of the exhaust valve can be performed. Therefore, it is possible to reduce the size of the fluid supply system as compared with a case where a device for supplying fuel and a device for opening and closing the exhaust valve are separately provided.
- the fluid supply system further includes an intake passage for guiding the working fluid from the working fluid supply device to an intake valve driving unit for opening and closing an intake valve that performs intake in the cylinder, and a second in the housing chamber. It is preferable to include a selection device that selectively supplies the working fluid stored at the end in the direction to the exhaust valve drive unit or the intake valve drive unit.
- an intake valve is provided for intake into the cylinder. Therefore, in the present invention, the working fluid stored at the end in the second direction in the storage chamber can be supplied to the exhaust valve driving unit or the intake valve driving unit by driving the selection device. .
- the exhaust valve is opened by the exhaust valve driving unit.
- the intake valve is opened by the intake valve driving unit. That is, by providing one working fluid supply device for one cylinder, it is possible to inject fuel into the cylinder, open / close the exhaust valve, and open / close the intake valve. Therefore, the size of the system can be reduced as compared with the case where the device for the intake valve is provided separately from the working fluid supply device.
- the supply device includes a working fluid between an end in the first direction in the accommodation chamber, an end in the second direction in the accommodation chamber, and between the first piston and the second piston in the accommodation chamber.
- the control device injects the working fluid from the injector into the cylinder as the fuel
- the control device supplies the working fluid to the end portion in the first direction in the housing chamber, and then the end portion in the second direction in the housing chamber.
- the working fluid is supplied to the chamber and the exhaust valve is opened, the working fluid is stored between the first piston and the second piston in the housing chamber in a state where the working fluid is stored at the end in the second direction in the housing chamber. Is preferably supplied.
- the second piston when the working fluid is supplied to the end portion on the second direction side in the storage chamber in a state where the working fluid is supplied to the end portion on the first direction side in the storage chamber, the second piston is In the housing chamber, the first fluid is moved in the first direction by the working fluid pressure at the end on the second direction side.
- the first piston moves in the first direction so as to be pushed by the second piston, and the working fluid at the end on the first direction side in the storage chamber is moved to the first opening and the first flow. It is supplied to the injector through a path. Then, the working fluid is injected into the cylinder as fuel from the injector.
- the first piston When the working fluid is supplied between the first piston and the second piston in the housing chamber in a state where the working fluid is stored in the end portion on the second direction side in the housing chamber, the first piston The second piston is moved in the second direction by the working fluid pressure between the first piston and the second piston.
- the working fluid at the end portion on the second direction side in the accommodation chamber is supplied to the exhaust valve driving unit via the second opening and the second flow path.
- the exhaust valve driving unit opens the exhaust valve when the working fluid is supplied. That is, the diesel engine can be appropriately driven by adjusting the working fluid pressure in each region in the storage chamber.
- the fluid supply system further includes a piston driving unit that moves the second piston in the first direction or the second direction.
- the response speed of a 2nd piston is made faster. can do.
- a fluid supply system for supplying a working fluid as a fuel into a cylinder of a diesel engine.
- the fluid supply system includes the above-described working fluid supply device, a first flow path for guiding the working fluid that has flowed out of the storage chamber through the first opening to the injector that injects fuel into the cylinder, and the cylinder.
- a control device for controlling the movement of the piston.
- the control device When injecting the working fluid from the injector into the cylinder as the working fluid, the control device supplies the working fluid to the end in the first direction in the accommodating chamber, and then moves the first piston in the first direction, In the case of opening, the second piston is moved in the second direction in a state where the working fluid is stored at the end in the second direction in the storage chamber.
- the end portion on the first direction side in the accommodation chamber is changed.
- the working fluid is pushed out by the first piston and flows out of the storage chamber through the first opening.
- Such working fluid is supplied to the injector through the first flow path, and this injector injects the supplied working fluid into the cylinder of the diesel engine as fuel.
- the working fluid at the second direction end in the accommodation chamber is changed. Then, it is pushed out by the second piston and flows out of the storage chamber through the second opening. At this time, the working fluid flowing out from the second opening is depressurized from the pressure when supplied into the storage chamber. Then, such a working fluid is supplied to the exhaust valve driving unit via the second flow path, and the exhaust valve driving unit opens the exhaust valve when the working fluid is supplied.
- both supply of fuel to the injector and opening and closing of the exhaust valve can be performed. Therefore, it is possible to reduce the size of the fluid supply system as compared with a case where a device for supplying fuel and a device for opening and closing the exhaust valve are separately provided.
- the fluid supply system further includes an intake passage for guiding the working fluid from the working fluid supply device to an intake valve driving unit for opening and closing an intake valve that performs intake in the cylinder, It is preferable to include a selection device that selectively supplies the working fluid stored in the two end portions to the exhaust valve drive unit or the intake valve drive unit.
- an intake valve is provided for intake into the cylinder. Therefore, in the present invention, the working fluid stored at the end in the second direction in the storage chamber can be supplied to the exhaust valve driving unit or the intake valve driving unit by driving the selection device. .
- the exhaust valve is opened by the exhaust valve driving unit.
- the intake valve is opened by the intake valve driving unit. That is, by providing one working fluid supply device for one cylinder, it is possible to inject fuel into the cylinder, open / close the exhaust valve, and open / close the intake valve. Therefore, the size of the system can be reduced as compared with the case where the device for the intake valve is provided separately from the working fluid supply device.
- the supply device includes a working fluid between an end in the first direction in the accommodation chamber, an end in the second direction in the accommodation chamber, and between the first piston and the second piston in the accommodation chamber.
- the control device injects the working fluid from the injector into the cylinder as the fuel
- the control device supplies the working fluid to the end portion in the first direction in the housing chamber, and then the end portion in the second direction in the housing chamber.
- the working fluid is supplied between the first piston and the second piston in the housing chamber and the exhaust valve is opened after the working fluid is supplied to the injector, It is preferable to supply the working fluid between the first piston and the second piston in the storage chamber in a state where the working fluid is stored at the end portions in the two directions.
- the working fluid pressure at the end portion on the second direction side in the storage chamber is maintained in a state where the working fluid is supplied to the end portion on the first direction side in the storage chamber.
- a working fluid is supplied between the first piston and the second piston.
- the first piston is moved in the first direction by increasing the working fluid pressure between the first piston and the second piston in the accommodation chamber.
- the working fluid at the end portion on the first direction side in the containing chamber is supplied to the injector through the first opening and the first flow path. Then, the working fluid is injected into the cylinder as fuel from the injector.
- the working fluid is supplied between the first piston and the second piston in the housing chamber in a state where the holding pressure of the working fluid pressure at the end portion on the second direction side is released in the housing chamber, Due to the working fluid pressure between the first piston and the second piston, the second piston is moved in the second direction.
- the working fluid at the end portion on the second direction side in the accommodation chamber is supplied to the exhaust valve driving unit via the second opening and the second flow path.
- the exhaust valve driving unit opens the exhaust valve when the working fluid is supplied. That is, the diesel engine can be appropriately driven by adjusting the working fluid pressure in each region in the storage chamber.
- the fluid supply system further includes a first piston drive unit that moves the first piston in the first direction or the second direction, and a second piston that moves the second piston in the first direction or the second direction.
- a first piston drive unit that moves the first piston in the first direction or the second direction
- a second piston that moves the second piston in the first direction or the second direction.
- two piston drive units are provided.
- a 1st piston and a 2nd piston are compared. Can increase the response speed.
- the supply device has a quantitative device that supplies a working fluid quantified to a predetermined amount set in advance to the end portion in the first direction in the storage chamber.
- a large amount of working fluid that is larger than a single fuel injection amount by the injector is stored.
- An appropriate amount of working fluid is supplied to the injector by adjusting the amount of movement of the piston in the cylinder.
- it is necessary to appropriately detect the movement amount of the piston and the configuration of the piston becomes complicated, or the configuration for detecting the pressure in the high-pressure cylinder becomes complicated.
- the first piston and the second piston are provided in the storage chamber of the working fluid supply apparatus of the present invention, and it is necessary to supply the working fluid not only to the injector but also to the exhaust valve driving unit. It is difficult to quantify the working fluid supplied to the injector in such a storage chamber.
- the working fluid quantified by the quantification device provided outside the accommodation chamber is supplied to the end portion in the first direction in the accommodation chamber. Therefore, when supplying the working fluid to the injector, an appropriate amount of the working fluid is supplied to the injector without controlling the first piston with high accuracy.
- the schematic diagram which shows 1st Embodiment of the fluid supply system of this invention The schematic diagram which shows a mode that fuel is supplied in the storage chamber in 1st Embodiment.
- the schematic diagram which shows a mode that the inside of a cylinder is scavenged in 1st Embodiment.
- the schematic diagram which shows 2nd Embodiment of the fluid supply system of this invention The schematic diagram which shows 2nd Embodiment of the fluid supply system of this invention.
- the fluid supply system 11 is a system for supplying fuel (for example, heavy oil) into a plurality of cylinders 12 (only one is shown in FIG. 1) of a diesel engine.
- the fluid supply system 11 includes a plurality (only one is shown in FIG. 1) of working fluid supply devices 13 corresponding to each cylinder 12 and a control device 16 that controls the working fluid supply device 13.
- the working fluid supply device 13 supplies fuel as a working fluid to a common rail injector (external device) 17, or supplies a different type of hydraulic oil (working fluid) to the exhaust valve drive unit (external device) 15. Or supply.
- the exhaust valve driving unit 15 operates an exhaust valve 14 used for exhausting or scavenging the cylinder 12.
- the diesel engine is mounted on a ship as a moving body.
- an in-cylinder piston 20 is provided.
- the in-cylinder piston 20 is movable in the vertical direction.
- a plurality (only two are shown in FIG. 1) of intake ports 21 are formed on the side wall of the cylinder 12.
- a gas for example, air
- a pressurizer for example, a pump
- the inside of the cylinder 12 is scavenged. “Scavenging” means that in a cylinder 12 of a two-cycle diesel engine, new gas (air) is sucked into the cylinder 12 and gas is discharged from the cylinder 12 after combustion.
- the working fluid supply device 13 includes a main body 31.
- a housing chamber 30 is formed in the main body 31.
- the interior of the storage chamber 30 includes a first space 32 positioned on the upper side and a second space 33 positioned on the lower side of the first space 32.
- the longitudinal sectional area of the first space 32 is smaller than the longitudinal sectional area of the second space 33.
- a first piston 34 and a second piston 35 located below the first piston 34 are provided.
- the first piston 34 has a column shape. That is, the surface area of the upper end of the first piston 34 is substantially equal to the surface area of the lower end of the first piston 34.
- the first piston 34 slides along the inner surface of the main body 31 upward in the first space 32 and downward in the second direction. Further, the lower end of the first piston 34 is located in the second space 33 even when the first piston 34 is located at the uppermost position in the storage chamber 30.
- the second piston 35 has a columnar shape.
- the surface area of the upper end of the second piston 35 is larger than the surface area of the lower end of the first piston 34 and is substantially equal to the surface area of the lower end of the second piston 35.
- the second piston 35 slides in the second space 33 in the vertical direction along the inner surface of the main body 31 separately from the first piston 34.
- a coil spring 36 as an urging member is provided below the second piston 35 in the accommodation chamber 30.
- the coil spring 36 biases the second piston 35 upward.
- the urging member may be a member other than the coil spring 36 (for example, an air spring or a magnet) as long as it can push the second piston 35 upward.
- a first opening 37 that communicates the inside and the outside of the storage chamber 30 is formed in the upper wall portion 31 a of the main body portion 31.
- a fuel supply flow path (first flow path) 38 for guiding fuel to the injector 17 is connected to the first opening 37.
- a second opening 39 that communicates the inside and the outside of the storage chamber 30 is formed in the lower wall portion 31 b of the main body portion 31.
- An exhaust valve flow path (second flow path) 40 for guiding hydraulic oil to the exhaust valve drive section 15 is connected to the second opening 39.
- the main body 31 is provided with a communication path 41.
- the communication path 41 includes a region below the second piston 35 in the accommodation chamber 30 (hereinafter also referred to as “first region”), and the first and second pistons 34, An area between 35 (hereinafter also referred to as “second area”) communicates with each other. Note that the first region corresponds to the end of the accommodation chamber 30 in the second direction.
- a first electromagnetic valve 42 as a fluid discharge part is provided in the middle position of the communication path 41.
- the first electromagnetic valve 42 is connected to a discharge passage 44 that extends to a hydraulic oil tank 43 that stores hydraulic oil.
- the first electromagnetic valve 42 operates to switch the flow direction of the hydraulic oil based on a command from the control device 16.
- the 1st solenoid valve 42 When the 1st solenoid valve 42 is the 1st mode, the 1st solenoid valve 42 regulates outflow of hydraulic fluid from the 1st field and the 2nd field.
- the first solenoid valve 42 When the first solenoid valve 42 is in the second mode, the first solenoid valve 42 regulates the outflow of hydraulic oil from the first region to the hydraulic oil tank 43, while the first electromagnetic valve 42 from the second region to the hydraulic oil tank 43. Allow hydraulic oil to escape.
- the first electromagnetic valve 42 When the first electromagnetic valve 42 is in the third mode, the first electromagnetic valve 42 regulates the flow of hydraulic oil from the second region to the hydraulic oil tank 43, while the first electromagnetic valve 42 from the first region to the hydraulic oil tank 43. Allow hydraulic oil to escape.
- the 1st solenoid valve 42 When the 1st solenoid valve 42 is the 4th mode, the 1st solenoid valve 42 permits the outflow of hydraulic fluid from the 1st field and the 2nd field.
- the working fluid supply device 13 is provided with a supply device 50 for supplying fuel and hydraulic oil individually into the storage chamber 30.
- the supply device 50 includes a first supply mechanism 51 that supplies fuel and a second supply mechanism 52 that supplies hydraulic oil.
- the first supply mechanism 51 is provided with a pressure feeding device 56 as a metering device and a first pump 54.
- the pumping device 56 pumps fuel to a region above the first piston 34 (hereinafter referred to as “third region”).
- the third region corresponds to an end portion in the first direction in the storage chamber 30.
- the first pump 54 supplies the fuel stored in the fuel tank 53 into the pressure feeding device 56.
- the pressure feeding device 56 includes a storage unit (not shown) that temporarily stores supplied fuel, a piston (not shown) that is displaced to send the fuel in the storage unit 30 to the storage chamber 30, and a motor that serves as a power source for the piston. And an actuator (not shown), and a detection sensor for detecting the amount of movement of the piston.
- the actuator operates based on a command from the control device 16. Specifically, the actuator of the pressure feeding device 56 is driven so that the fuel in the storage portion is discharged by the piston when the amount of fuel stored in the storage portion reaches a preset specified amount. That is, the pressure feeding device 56 intermittently sends a specified amount of fuel to the third region of the storage chamber 30.
- the first supply mechanism 51 is provided with a fuel return mechanism 55.
- the fuel return mechanism 55 returns a part of the fuel in the storage chamber 30 to the fuel tank 53 when the fuel pressure in the third region of the storage chamber 30 is equal to or higher than a predetermined fuel pressure regulation value.
- the second supply mechanism 52 is discharged from the second pump 60 and the second pump 60 that discharges (pressure feeds) the hydraulic oil stored in the hydraulic oil tank 43 toward the storage chamber 30.
- a second electromagnetic valve (selection unit) 61 for selectively guiding hydraulic oil to the first region or the second region is provided.
- the second electromagnetic valve 61 can be changed to any one of the first mode, the second mode, and the third mode based on a command from the control device 16.
- the second electromagnetic valve 61 is in the first mode, the supply of hydraulic oil to the first region and the second region is prohibited, and when the second electromagnetic valve 61 is in the second mode, the first region. Supply of hydraulic oil to is allowed.
- the 2nd electromagnetic valve 61 is a 3rd aspect, supply of the hydraulic fluid to a 2nd area
- An accumulator 63 is connected to the flow path 62 between the second pump 60 and the second electromagnetic valve 61.
- the exhaust valve drive unit 15 is a hydraulic drive unit.
- the exhaust valve drive section 15 urges the cylinder section 71, the exhaust valve piston 72 moving in one direction (the vertical direction in FIG. 1) in the hydraulic chamber 70, and the exhaust valve piston 72 upward in FIG. And a coil spring 73.
- a hydraulic chamber 70 is formed in the cylinder portion 71.
- hydraulic fluid is supplied from the hydraulic fluid supply device 13 through the exhaust valve flow path 40.
- a first switching valve 75 that operates based on a command from the control device 16 is provided in the middle position of the exhaust valve flow path 40.
- the first switching valve 75 is connected to a first discharge flow path 76 for guiding the hydraulic oil to the hydraulic oil tank 43.
- the first switching valve 75 is changed to any one of the first aspect, the second aspect, and the third aspect. That is, when the first switching valve 75 is in the first mode, the flow of hydraulic oil from the working fluid supply device 13 to the exhaust valve drive unit 15 is allowed. At this time, hydraulic fluid does not flow into the first discharge channel 76 via the first switching valve 75. Further, when the first switching valve 75 is in the second mode, the flow (discharge) of the hydraulic oil from the exhaust valve driving unit 15 to the hydraulic oil tank 43 via the first discharge flow path 76 is caused. Permissible. At this time, the flow of the working oil from the working fluid supply device 13 to the exhaust valve driving unit 15 is regulated by the first switching valve 75. Further, when the first switching valve 75 is in the third mode, the hydraulic fluid flows out from the working fluid supply device 13 through the second opening 39 and the hydraulic fluid from the exhaust valve driving unit 15 flows. Outflow is regulated.
- the in-cylinder piston 20 rises while the exhaust valve 14 is closed, the gas in the cylinder 12 is adiabatically compressed.
- the fuel quantified to the specified amount is pumped (supplied) to the third region in the storage chamber 30 by the command from the control device 16.
- the first and second pistons 34 and 35 biased upward by the coil spring 36 are moved downward against the biasing force of the coil spring 36 by the fuel pressure (working fluid pressure) in the third region.
- the fuel is supplied again by the first pump 54 into the pressure feeding device 56 that has sent the prescribed amount of fuel to the third region.
- the pressure feeding device 56 pumps the prescribed amount of fuel to the third region in the storage chamber 30.
- the hydraulic oil starts to be supplied to the first region of the storage chamber 30.
- the first electromagnetic valve 42 is changed to the first mode, and the outflow of hydraulic oil from the first region and the second region via the communication path 41 is restricted.
- the first switching valve 75 is changed to the second mode, and the outflow of hydraulic oil from the first region via the first discharge channel 76 is restricted.
- the second electromagnetic valve 61 is changed to the second mode in this state, the hydraulic oil is supplied to the first region in the storage chamber 30 by the second pump 60 and the accumulator 63, and the hydraulic pressure in the first region is set. Rises.
- the second piston 35 is slid upward by the hydraulic pressure in the first region and the urging force from the coil spring 36. Then, the first piston 34 slides upward so as to be pushed by the second piston 35.
- the fuel stored in the third region in the storage chamber 30 is pushed out by the first piston 34 that slides upward.
- the upper surface area of the first piston 34 is smaller than the lower surface area of the second piston 35. Therefore, the pressure of the fuel flowing out from the third region through the first opening 37 is higher than the hydraulic pressure supplied to the first region in order to slide the second piston 35 upward.
- the fuel that has flowed out of the first opening 37 is introduced into the injector 17 through the fuel supply flow path 38. Then, fuel is injected from the injector 17 into the cylinder 12. As a result, the fuel injected into the cylinder 12 is naturally combusted.
- the in-cylinder piston 20 moves toward the bottom dead center using the force obtained by the combustion of the fuel injected into the cylinder 12.
- the hydraulic oil starts to be supplied to the second region in the storage chamber 30. That is, the first electromagnetic valve 42 is maintained in the first mode, and the outflow of hydraulic oil from the first region and the second region to the hydraulic oil tank 43 via the communication path 41 is restricted. Further, the first switching valve 75 is changed to the first mode, and the flow of the hydraulic oil from the first region to the exhaust valve driving unit 15 is allowed.
- the second electromagnetic valve 61 is changed to the third mode in this state, the hydraulic oil is supplied to the second region in the storage chamber 30 by the second pump 60 and the accumulator 63, and the hydraulic pressure in the second region is set. Rises.
- the first piston 34 can hardly move upward. Therefore, the second piston 35 slides downward against the urging force from the coil spring 36 by the hydraulic pressure in the second region. Then, hydraulic oil is supplied from the first region into the hydraulic chamber 70 of the cylinder portion 71 that constitutes the exhaust valve drive unit 15 via the first exhaust valve flow path 40. As a result, as the operating hydraulic pressure in the hydraulic chamber 70 increases, the exhaust valve piston 72 moves downward. Then, the exhaust valve 14 connected to the exhaust valve piston 72 is opened, and the inside of the cylinder 12 is exhausted.
- the pressure in the hydraulic chamber 70 of the cylinder portion 71 is maintained. That is, the first switching valve 75 is switched to the third mode. At this time, the outflow of hydraulic oil from the first region to the exhaust valve flow path 40 is also restricted. Then, while the exhaust valve 14 is kept open, the first electromagnetic valve 42 is changed to the fourth mode. That is, the hydraulic oil is allowed to flow out from the first region and the second region of the storage chamber 30 through the communication path 41. At this time, the second electromagnetic valve 61 is changed to the first mode, and the supply of hydraulic oil to the second region of the storage chamber 30 is stopped. Then, the second piston 35 starts to slide upward using the biasing force from the coil spring 36. As a result, the hydraulic oil in the second region is discharged to the hydraulic oil tank 43 and the first region.
- the fuel supply processing routine executed by the control device 16 when driving the diesel engine as described above will be described with reference to the flowchart shown in FIG.
- the fuel supply processing routine of this embodiment is a processing routine for supplying fuel to one cylinder 12.
- the control device 16 determines whether or not the gas in the cylinder 12 is being compressed by the movement (rise) to the top dead center of the in-cylinder piston 20 (step S10).
- step S10: NO the control device 16 repeatedly performs the determination process of step S10 until the compression is being performed.
- step S10: YES the control device 16 drives the supply device 50 to supply fuel to the third region in the storage chamber 30 (step S11). That is, the control device 16 controls the pressure feeding device 56 so that a specified amount of fuel is supplied to the third region.
- the control device 16 drives the supply device 50 to supply hydraulic oil to the first region in the storage chamber 30 (step S12). That is, the control device 16 sets the first electromagnetic valve 42 in the second mode, restricts the outflow of hydraulic oil from the first region, sets the first switching valve 75 in the second mode, and starts from the first region. The outflow of hydraulic oil to the exhaust valve drive unit 15 is restricted.
- the control device 16 operates the second pump 60 with the second electromagnetic valve 61 in the second mode.
- control apparatus 16 drives the supply apparatus 50 to supply hydraulic oil to the 2nd area
- control device 16 holds the exhaust valve 14 in an open state (step S14). That is, the control device 16 sets the first switching valve 75 in the third mode and stops the supply of hydraulic oil to the second region. Moreover, the control apparatus 16 makes the 1st electromagnetic valve 42 a 4th aspect.
- step S15 determines whether the scavenging in the cylinder 12 has been completed, that is, through the upward region 22 in the cylinder 12 and the intake port 21 between the outside by the rise of the in-cylinder piston 20 that has reached bottom dead center. It is determined whether or not the communication state has been eliminated (step S15).
- step S15: NO the control device 16 proceeds to step S14 described above.
- step S16 the control device 16 closes the exhaust valve 14 (step S16). That is, the control apparatus 16 makes the 2nd electromagnetic valve 61 a 1st aspect. Further, the control device 16 sets the first switching valve 75 to the second mode, and causes the hydraulic oil in the hydraulic chamber 70 of the exhaust valve driving unit 15 to flow out to the hydraulic oil tank 43. Thereafter, the control device 16 proceeds to step S10 described above.
- the second piston 35 is slid upward in a state where fuel is supplied to the third region in the storage chamber 30 by the operation of the first pump 54 and the pressure feeding device 56. The Then, the first piston 34 is pushed up by the second piston 35 and moves upward. As a result, the fuel in the third region flows out of the storage chamber 30 through the first opening 37 and is guided to the injector 17 by the fuel supply flow path 38. Then, the fuel guided to the injector 17 is injected into the cylinder 12.
- the second piston 35 is slid downward in a state where the hydraulic oil is supplied to the first region in the storage chamber 30. Then, the hydraulic oil in the first region flows out of the storage chamber 30 through the second opening 39 and is guided to the exhaust valve driving unit 15 by the exhaust valve channel 40. As a result, the exhaust valve drive unit 15 is driven and the closed exhaust valve 14 is opened. That is, by providing one working fluid supply device 13 for each cylinder 12, the working fluid can be individually supplied to a plurality of external devices (in this case, the injector 17 and the exhaust valve driving unit 15). it can. Therefore, the fluid supply system 11 can be downsized as compared with the case where the working fluid supply device for the injector 17 and the working fluid supply device for the exhaust valve drive unit 15 are provided separately.
- the working fluid supply device 13 can individually supply the working fluid to the injector 17 and the exhaust valve driving unit 15. Therefore, by appropriately controlling the driving of the supply device 50, fuel and hydraulic oil can be supplied to the injector 17 and the exhaust valve driving unit 15 at appropriate timings, respectively. That is, the diesel engine can be driven appropriately.
- the first and second pistons 34 and 35 are individually controlled in the storage chamber 30 by individually controlling the fluid pressures in the first region, the second region, and the third region in the storage chamber 30. Slide. That is, fuel and hydraulic oil are supplied to the injector 17 and the exhaust valve drive unit 15 without providing a drive source (an actuator such as a motor) for sliding the first and second pistons 34 and 35, respectively. Can do. Therefore, complication of the working fluid supply device 13 is suppressed by the amount that the drive source is unnecessary.
- the cross-sectional area of the first space 32 is smaller than the cross-sectional area of the second space 33. Therefore, the fuel pressure supplied from the first opening 37 to the injector 17 can be higher than the hydraulic pressure supplied from the second opening 39 to the exhaust valve drive unit 15. Therefore, high pressure fuel can be injected into the cylinder 12 from the injector 17.
- a coil spring 36 for urging the second piston 35 upward is provided in the accommodation chamber 30. Therefore, when supplying fuel to the injector 17, the first and second pistons 34 and 35 can be slid upward using the biasing force from the coil spring 36, respectively.
- a fixed amount of fuel is supplied to the third region of the storage chamber 30 by the pumping device 56.
- the fuel supply amount to the injector 17 is adjusted in the storage chamber 30, and the sensor is provided with a complicated sealing mechanism to withstand high temperature and high pressure.
- the configuration in the storage chamber 30 is complicated.
- the quantified fuel is supplied to the third region, it is not necessary to control the movement amount of the first piston 34 with high accuracy, and thus the configuration in the accommodation chamber 30 is complicated. Can be suppressed.
- the pressure feeding device 56 it is necessary to adjust the amount of fuel supplied to the injector 17 after being supplied to the third region of the storage chamber 30, and therefore the amount of movement of the first piston 34 Need to control.
- the movement amount of the first piston 34 may not be adjusted with high accuracy. That is, the pressure of the fuel is adjusted while the working fluid supply device 13 is performing work other than fuel supply to the injector 17 (specifically, work for operating the exhaust valve 14). Therefore, it becomes possible to quickly supply high-pressure fuel to the injector 17.
- the cylinder 12 constituting the four-cycle diesel engine has an intake valve 80 and a hydraulic intake valve drive unit 81 that drives the intake valve 80. Is provided.
- the working fluid supply device 13 ⁇ / b> A of the fluid supply system 11 ⁇ / b> A that supplies fuel to the cylinder 12 can supply hydraulic oil to the intake valve drive unit 81.
- 3rd opening 82 is formed in the lower wall part 31b of the main-body part 31 of the working fluid supply apparatus 13A separately from the 2nd opening part 39.
- the third opening 82 is connected to the intake valve driving unit 81 via the intake flow path 83.
- the hydraulic oil stored in the first region can be supplied to the exhaust valve drive unit 15 and the intake valve drive unit 81.
- the intake flow path 83 is provided with a second switching valve 84 that operates according to a command from the control device 16.
- the second switching valve 84 is connected to a second discharge flow path 85 for guiding the hydraulic oil to the hydraulic oil tank 43.
- the second switching valve 84 can be changed to any one of the first aspect, the second aspect, and the third aspect. That is, when the 2nd switching valve 84 is a 1st aspect, the flow of the hydraulic fluid from 13A of working fluid supply apparatuses to the intake valve drive part 81 is accept
- the flow of the working oil from the working fluid supply device 13 ⁇ / b> A to the intake valve driving unit 81 is regulated by the second switching valve 84.
- the second switching valve 84 is in the third mode, the hydraulic fluid flows out from the hydraulic fluid supply device 13A through the third opening 82 and the hydraulic fluid from the intake valve drive unit 81 flows. Outflow is regulated.
- the hydraulic oil stored in the first region in the storage chamber 30 is selectively supplied to the exhaust valve driving unit 15 or the intake valve driving unit 81 by the first switching valve 75 and the second switching valve 84.
- a selection device is configured to be driven as much as possible.
- the intake valve drive unit 81 urges the cylinder unit 91, the intake valve piston 92 moving in one direction (the vertical direction in FIG. 7) in the hydraulic chamber 90, and the intake valve piston 92 upward in FIG. And a coil spring 93.
- a hydraulic chamber 90 is formed in the cylinder portion 91.
- the intake valve piston 92 is moved upward in FIG. 7 by the biasing force of the coil spring 93.
- the intake valve 80 connected to the intake valve piston 92 is closed.
- the intake valve piston 92 moves downward in FIG. 7 against the urging force from the coil spring 93 by the hydraulic pressure in the hydraulic chamber 90.
- the intake valve 80 opens.
- the first switching valve 75 is changed to the third mode, so that the hydraulic chamber 70 of the exhaust valve drive unit 15 is held and the first chamber in the storage chamber 30 is maintained. The area pressure is maintained. That is, the exhaust valve 14 is kept open.
- the second switching valve 84 is in the third mode.
- the first switching valve 75 is changed to the second mode. Furthermore, the 1st solenoid valve 42 is changed into a 1st aspect, and the outflow of the hydraulic fluid from a 1st area
- the second switching valve 84 is changed to the third mode, and the supply of hydraulic oil to the second region in the storage chamber 30 is stopped. Then, since the hydraulic chamber 90 of the intake valve drive unit 81 is held, the open state of the intake valve 80 is maintained. At this time, the first switching valve 75 is changed to the third mode.
- the first electromagnetic valve 42 is changed to the fourth mode. That is, the hydraulic oil is allowed to flow out from the first region and the second region of the storage chamber 30 through the communication path 41. Then, the second piston 35 starts to slide upward using the biasing force from the coil spring 36. As a result, the hydraulic oil in the second region is discharged to the hydraulic oil tank 43 and the first region.
- the second switching valve 84 is changed to the second mode. Therefore, the hydraulic oil in the hydraulic chamber 90 of the intake valve drive unit 81 is discharged to the hydraulic oil tank 43 via the second discharge flow path 85. Then, the operating hydraulic pressure in the hydraulic chamber 90 decreases, and the intake valve piston 92 moves upward by the urging force of the coil spring 93. As a result, the intake valve 80 is closed.
- the third embodiment is different from the first embodiment in that fuel as an example of a working fluid is supplied to all regions in the storage chamber 30.
- fuel as an example of a working fluid is supplied to all regions in the storage chamber 30.
- parts different from the first embodiment will be mainly described.
- the same or corresponding member configurations as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the fluid supply system 11B of this embodiment includes a working fluid supply device 13B and each region (first region, second region, and third region) in the storage chamber 30 of the working fluid supply device 13B. And a supply device 50A for supplying the fuel individually.
- the supply device 50A includes a first supply mechanism 51A and a second supply mechanism 52A provided separately from the first supply mechanism 51A.
- the first supply mechanism 51A is provided with a pressure feeding device 56A and a first pump 54 that discharges fuel stored in the fuel tank 53 to the pressure feeding device 56A.
- the pressure feeding device 56A includes a storage part (not shown) that temporarily stores the fuel supplied from the first pump 54, and a piston (not shown) that is displaced so as to send the fuel in the storage part to the storage chamber 30 side. ing.
- the piston is displaced based on the fuel pressure (working fluid pressure) of the fuel supplied from the second supply mechanism 52A.
- the second supply mechanism 52A includes a second pump 60 that discharges fuel stored in the fuel tank 53, and a third electromagnetic valve that is disposed downstream of the second pump 60 (side closer to the storage chamber 30). 100.
- An accumulator 63 is connected to the flow path 62 that connects the second pump 60 and the third electromagnetic valve 100.
- the third solenoid valve 100 is configured to be switchable between the first mode and the second mode by a command from the control device 16.
- the fuel discharged from the second pump 60 is supplied as hydraulic oil to the pressure feeding device 56A.
- the fuel discharged from the second pump 60 is supplied to the pressure feeding device 56A as hydraulic oil in this way, in the pressure feeding device 56A, the piston is displaced by the fuel pressure based on the fuel from the second pump 60, and in the storage unit The fuel is pumped toward the third region in the storage chamber 30.
- the third solenoid valve 100 is in the second mode, the fuel discharged from the second pump 60 is supplied to the first region and the second region in the storage chamber 30.
- the fuel is supplied between the third electromagnetic valve 100 and the storage chamber 30 so that the fuel supplied via the third electromagnetic valve 100 according to the second aspect is guided to the first region or the second region.
- a second electromagnetic valve 61 is provided. That is, when the third solenoid valve 100 is in the second mode and the second solenoid valve 61 is in the second mode, the fuel discharged from the second pump 60 is discharged to the first region in the storage chamber 30. Supplied. Further, when the third electromagnetic valve 100 is in the second mode and the second electromagnetic valve 61 is in the third mode, the fuel discharged from the second pump 60 is discharged to the second region in the storage chamber 30. Supplied. Therefore, in this embodiment, the third electromagnetic valve 100 and the second electromagnetic valve 61 constitute a selection mechanism.
- each supply mechanism 51A, 52A pumps fuel from the common fuel tank 53. Therefore, both the fuel injection by the injector 17 and the opening and closing of the exhaust valve 14 can be performed by one type of working fluid (fuel).
- the fourth embodiment is different from the third embodiment in that the fuel supplied into the storage chamber 30 is decompressed and supplied to the exhaust valve driving unit 15 as hydraulic oil.
- portions different from the third embodiment will be mainly described. Further, the same or corresponding member configurations as those of the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- a columnar first piston 34A and a second piston 35A located below the first piston 34A are provided in the storage chamber 30 of the working fluid supply device 13F. Yes.
- the lower end of the first piston 34 ⁇ / b> A is located in the first space 32 of the storage chamber 30 even when the first piston 34 ⁇ / b> A moves downward.
- the upper portion of the second piston 35A is a columnar small-diameter portion 35A1 having a narrow cross-sectional area along the vertical direction, and the lower portion of the second piston 35A has a cross-sectional area along the vertical direction of the small-diameter portion 35A1.
- This is a wide columnar large-diameter portion 35A2.
- the upper end of the small diameter portion 35 ⁇ / b> A ⁇ b> 1 is located in the first space 32 of the storage chamber 30.
- the surface area of the upper end of the small diameter portion 35A1 is substantially equal to the surface area of the upper end and the lower end of the first piston 34A.
- the large diameter portion 35 ⁇ / b> A ⁇ b> 2 is located in the second space 33 of the storage chamber 30.
- the surface area of the lower end of the large diameter portion 35A2 is larger than the surface area of the upper end of the first piston 34A.
- a first coil spring 131 as a first biasing member is provided below the second piston 35 ⁇ / b> A in the storage chamber 30.
- the first coil spring 131 urges the second piston 35A upward.
- a second coil spring 132 as a second urging member is provided between the first piston 34A and the second piston 35A in the accommodation chamber 30.
- the second coil spring 132 biases the second piston 35A downward.
- the downward biasing force applied to the second piston 35A by the second coil spring 132 is weaker than the upward biasing force applied to the second piston 35A by the first coil spring 131.
- the first urging member and the second urging member are urging members other than the coil spring (for example, an air spring, a magnet) as long as the second piston 35A can be urged. Also good.
- the supply device 50A of this embodiment can supply fuel having a higher pressure than the supply device 50A of the third embodiment to each region (first region, second region, and third region) of the storage chamber 30. .
- the first pump 54 pressure-feeds (supplies) fuel from the inside of the pressure-feeding device 56 ⁇ / b> A to the third region in the storage chamber 30 based on a command from the control device 16.
- the first electromagnetic valve 42 is changed to the second mode. Therefore, fuel outflow from the second region in the storage chamber 30 via the communication path 41 is allowed. On the other hand, the outflow of fuel from the first region in the storage chamber 30 via the communication path 41 is restricted.
- the first piston 34 ⁇ / b> A slides downward against the biasing force from the second coil spring 132. After a predetermined amount of fuel is sent to the third region, the fuel discharge from the pressure feeding device 56 is stopped. Then, fuel is supplied again into the pressure feeding device 56 by the first pump 54.
- the first electromagnetic valve 42 is changed to the first mode when the in-cylinder piston 20 reaches the top dead center or starts moving (lowering) downward from the top dead center. Then, the outflow of fuel from the first region and the second region in the storage chamber 30 via the communication path 41 is restricted. Then, fuel is supplied as hydraulic oil to the second region. At this time, the first switching valve 75 has been changed to the second mode, and the outflow of fuel from the first region via the first discharge channel 76 is restricted.
- the fuel pressure in the second region in the storage chamber 30 increases.
- the first piston 34A is slid upward by the fuel pressure in the second region and the urging force of the second coil spring 132.
- the injector 17 injects fuel into the cylinder 12 based on a command from the control device 16.
- the fuel injected into the cylinder 12 is naturally combusted.
- the in-cylinder piston 20 moves toward the bottom dead center using the force obtained by the combustion of the fuel injected into the cylinder 12.
- the first switching valve 75 is changed to the first mode, and fuel supply from the first region to the exhaust valve drive unit 15 is allowed. Is done.
- the first piston 34A is positioned at the uppermost position in the accommodation chamber 30, and the fuel is supplied to the second region. Therefore, the second piston 35A slides downward against the upward biasing force from the first coil spring 131 by the fuel pressure in the second region and the biasing force from the second coil spring 132. .
- the fuel in the first region is supplied to the exhaust valve drive unit 15 as hydraulic oil.
- the exhaust valve drive unit 15 opens the exhaust valve 14 and exhausts the cylinder 12.
- the surface area of the upper end of the second piston 35A is narrower than the surface area of the lower end of the second piston 35A. For this reason, the exhaust valve drive unit 15 is supplied with fuel whose pressure is lower than the pressure of the fuel supplied to the second region in the storage chamber 30.
- the pressure in the hydraulic chamber 70 of the cylinder portion 71 is maintained. That is, the first switching valve 75 is switched to the third mode. At this time, the outflow of fuel from the first region to the exhaust valve passage 40 is also restricted. Then, while the exhaust valve 14 is kept open, the first electromagnetic valve 42 is changed to the fourth mode. That is, fuel outflow from the first region and the second region of the storage chamber 30 via the communication path 41 is allowed. At this time, the second electromagnetic valve 61 is changed to the first mode, and the supply of fuel to the second region of the storage chamber 30 is stopped.
- the second piston 35 ⁇ / b> A begins to slide upward against the downward biasing force from the second coil spring 132.
- the fuel in the second region is discharged to the fuel tank 53 and the first region. This process increases the amount of fuel stored in the first region.
- the in-cylinder piston 20 starts to rise.
- the communication state between the upper region 22 in the cylinder 12 and the outside is eliminated.
- the first switching valve 75 is changed to the second state in this state, the fuel in the hydraulic chamber 70 is moved by the upward movement of the exhaust valve piston 72 based on the urging force from the coil spring 73. Then, the fuel is discharged to the fuel tank 53 via the first discharge passage 76. Then, the pressure in the hydraulic chamber 70 is reduced, and the exhaust valve 14 is closed.
- the inside of the cylinder 12 is almost sealed, the inside of the cylinder 12 is adiabatically compressed by the rise of the in-cylinder piston 20. By repeating such a cycle, the diesel engine is driven.
- the first piston 34 ⁇ / b> A is slid upward in a state where fuel is supplied to the third region in the storage chamber 30. Then, the fuel in the third region flows out of the storage chamber 30 through the first opening 37 and is guided to the injector 17 by the fuel supply flow path 38. Then, the fuel guided to the injector 17 is injected into the cylinder 12. Further, in order to supply the fuel to the exhaust valve drive unit 15, the second piston 35 ⁇ / b> A is slid downward in a state where the fuel is stored in the first region in the storage chamber 30. Then, the fuel in the first region flows out of the storage chamber 30 through the second opening 39 and is guided to the exhaust valve driving unit 15 by the exhaust valve channel 40.
- the exhaust valve drive unit 15 is driven and the closed exhaust valve 14 is opened. That is, by providing one working fluid supply device 13F for each cylinder 12, the working fluid can be individually supplied to a plurality of external devices (in this case, the injector 17 and the exhaust valve drive unit 15). it can. Therefore, the fluid supply system 11 can be downsized as compared with the case where the working fluid supply device for the injector 17 and the working fluid supply device for the exhaust valve drive unit 15 are provided separately.
- the working fluid supply device 13F can supply fuel to the injector 17 and the exhaust valve drive unit 15 individually. Therefore, fuel can be supplied to the injector 17 and the exhaust valve drive unit 15 at appropriate timings by appropriately controlling the driving of the supply device 50A. That is, the diesel engine can be driven appropriately.
- the first and second pistons 34A, 35A are individually controlled in the storage chamber 30 by individually controlling the fuel pressure in the first region, the second region, and the third region in the storage chamber 30. Slide. That is, fuel can be supplied to the injector 17 and the exhaust valve drive unit 15 without providing a drive source (an actuator such as a motor) for sliding the first and second pistons 34A and 35A. Therefore, the complexity of the working fluid supply device 13F can be suppressed as much as the drive source is unnecessary.
- the cross-sectional area of the first space 32 is smaller than the cross-sectional area of the second space 33. Therefore, the fuel pressure supplied from the second opening 39 to the exhaust valve driving unit 15 can be lower than the fuel pressure supplied from the first opening 37 to the injector 17. Therefore, even when high-pressure fuel is supplied, it is possible to supply appropriately regulated fuel to the exhaust valve drive unit 15. That is, the exhaust valve drive unit 15 can appropriately open and close the exhaust valve 14.
- the second piston 35A can be slid upward and downward using the biasing force from the coil spring.
- the pressure of the fuel supplied into the storage chamber 30 can be reduced. Therefore, a supply device 50A that can supply high-pressure fuel to the storage chamber 30 can be employed. In this case, the diameter of the pipe for supplying the fuel can be reduced as compared with a case where a supply device capable of supplying low-pressure fuel is employed. Therefore, the entire system can be reduced in size.
- the fifth embodiment is different from the fourth embodiment in that fuel is supplied to a four-cycle diesel engine.
- parts different from the fourth embodiment will be mainly described.
- the same or corresponding member configurations as those of the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the cylinder 12 constituting the four-cycle diesel engine includes an intake valve 80 and a hydraulic intake valve drive unit 81 that drives the intake valve 80. Is provided.
- the working fluid supply device 13G of the fluid supply system 11A can supply fuel to the intake valve drive unit 81 as well.
- 3rd opening 82 is formed in the lower wall part 31b of the main-body part 31 of the working fluid supply apparatus 13G separately from the 2nd opening part 39.
- the third opening 82 is connected to the intake valve driving unit 81 via the intake flow path 83.
- the fuel stored in the first region can be supplied to the exhaust valve drive unit 15 and the intake valve drive unit 81.
- the intake flow path 83 is provided with a second switching valve 84 that operates according to a command from the control device 16.
- the second switching valve 84 is connected to a second discharge flow path 85 for guiding fuel to the fuel tank 53.
- the second switching valve 84 can be changed to the first aspect, the second aspect, and the third aspect. Accordingly, the first switching valve 75 and the second switching valve 84 should be used to selectively supply the fuel stored in the first region in the storage chamber 30 to the exhaust valve drive unit 15 or the intake valve drive unit 81.
- a selection device to be driven is configured.
- the fuel when supplying fuel to the injector 17, the fuel is supplied to the second region in the storage chamber 30, and the first piston 34A is slid upward.
- fuel is supplied to the second region in a state where the first electromagnetic valve 42 is set to the first mode and the outflow of fuel from the first region and the second region through the communication passage 41 is restricted. Is done.
- the second piston 35A is slid downward.
- the fuel stored in the first region flows out of the main body 31 through the second opening 39 so as to be pushed out by the second piston 35A.
- the exhaust valve drive unit 15 is supplied with fuel as hydraulic oil through the exhaust valve passage 40.
- the exhaust valve driving unit 15 is driven and the exhaust valve 14 is opened.
- the in-cylinder piston 20 moves upward in the cylinder 12. Therefore, most of the gas in the upper region 22 is exhausted out of the cylinder 12 from the exhaust valve 14 so as to be pushed out by the in-cylinder piston 20.
- the first switching valve 75 is changed to the third mode, so that the hydraulic chamber 70 of the exhaust valve drive unit 15 is held and the first chamber in the storage chamber 30 is maintained. The area pressure is maintained. That is, the exhaust valve 14 is kept open.
- the second switching valve 84 is changed to the third mode.
- the first switching valve 75 is changed to the second mode. Then, the fuel is discharged from the hydraulic chamber 70 of the exhaust valve drive unit 15 to the fuel tank 53. As a result, the exhaust valve piston 72 is moved upward by the urging force of the coil spring 73, whereby the exhaust valve 14 is closed.
- the fuel flows as hydraulic oil into the hydraulic chamber 90 of the intake valve drive unit 81 via the intake passage 83. Then, the fuel pressure in the hydraulic chamber 90 increases. As a result, the intake valve piston 92 moves downward against the biasing force of the coil spring 93, and the intake valve 80 connected to the intake valve piston 92 opens. At this timing, the cylinder piston 20 slides downward in the cylinder 12. Therefore, gas flows into the cylinder 12 via the intake valve 80.
- the second switching valve 84 is changed to the third mode, and the supply of fuel to the second region in the storage chamber 30 is stopped. Then, since the hydraulic chamber 90 of the intake valve drive unit 81 is held, the open state of the intake valve 80 is maintained. At this time, the first switching valve 75 is changed to the third mode.
- the first electromagnetic valve 42 is changed to the fourth mode. That is, fuel outflow from the first region and the second region of the storage chamber 30 via the communication path 41 is allowed. Then, using the biasing force from the first coil spring 131, the second piston 35A starts to slide upward against the biasing force from the second coil spring 132. As a result, the fuel in the second region is discharged to the fuel tank 53 and the first region.
- the second switching valve 84 is changed to the second mode. Therefore, the fuel in the hydraulic chamber 90 of the intake valve drive unit 81 is discharged to the fuel tank 53 via the second discharge channel 85. Then, the fuel pressure in the hydraulic chamber 90 decreases, and the intake valve piston 92 moves upward by the urging force of the coil spring 93. As a result, the intake valve 80 is closed.
- the fuel tanks used by the supply mechanisms 51A and 52A may be provided individually.
- the working fluid for supply to the injector 17 and the working fluid for supply to the exhaust valve drive unit 15 may be separate fluids.
- the supply device constituting the fluid supply system 11A may be changed to the supply device 50A.
- the fuel is also supplied to the first region and the second region in the storage chamber 30.
- the coil spring 36 may not be provided in the storage chamber 30.
- the second piston 35 in the working fluid supply device 13C of the fluid supply system 11C, the second piston 35 may be formed of a permanent magnet or a magnetic material having magnetism.
- the electromagnetic coil (piston drive unit) 110 is disposed so as to surround the second piston 35 outside the storage chamber 30. Further, the second piston 35 is slid in the vertical direction by using electromagnetic force generated by supplying current to the electromagnetic coil 110. According to this configuration, the response speed of the second piston 35 is compared with the case where the second piston 35 and the first piston 34 are slid by adjusting the working fluid pressure in each region in the storage chamber 30. Can be faster.
- the working fluid supply device 13E of the fluid supply system 11E includes an actuator (piston drive unit) 120 such as a motor that moves the second piston 35 in the vertical direction, and a drive from the actuator 120.
- actuator rod drive unit
- a connecting member 121 for transmitting force to the second piston 35 may be provided.
- the second piston 35 slides in the vertical direction by controlling the drive of the actuator 120.
- the second supply mechanism 52 and the first switching are performed.
- the valve 75 may be omitted.
- the hydraulic oil is supplied to the exhaust valve driving unit 15 by sliding the second piston 35 downward in a state where the hydraulic oil is stored in the first region in the storage chamber 30 in advance.
- the hydraulic oil in the exhaust valve drive unit 15 is returned to the first region.
- the flow direction of the hydraulic oil flowing out from the first region to the exhaust valve flow path 40 via the second opening 39 is selected as the exhaust valve drive unit 15 or the intake valve drive unit 81.
- a switching unit for switching automatically may be provided. In this case, when opening the exhaust valve 14, the switching unit is operated so that hydraulic oil is supplied to the exhaust valve driving unit 15. When opening the intake valve 80, the switching unit is operated so that the hydraulic oil is supplied to the intake valve drive unit 81. According to this configuration, the third opening 82 and the intake flow path 83 can be omitted.
- the fuel tank used by each supply mechanism 51A, 52A may be provided individually.
- the working fluid for supply to the injector 17 and the working fluid for supply to the exhaust valve drive unit 15 may be separate fluids.
- the coil springs 131 and 132 need not be provided in the storage chamber 30.
- the first piston 34A and the second piston 35A may be formed of a permanent magnet or a magnetic material having magnetism.
- the first electromagnetic coil (first piston drive unit) 140 is disposed so as to surround the first piston 34A outside the storage chamber 30, and the second piston 35A is surrounded outside the storage chamber 30.
- a second electromagnetic coil (second piston drive unit) 141 is arranged to do this. Then, the first piston 34 ⁇ / b> A is slid in the vertical direction by using an electromagnetic force generated by supplying a current to the first electromagnetic coil 140.
- the second piston 35 ⁇ / b> A is slid in the vertical direction by using an electromagnetic force generated by supplying a current to the second electromagnetic coil 141.
- the second piston 35A and the first piston 35A are compared with the case where the second piston 35A and the first piston 34A are slid by adjusting the working fluid pressure in each region in the storage chamber 30.
- the response speed of the piston 34A can be increased.
- the second supply mechanism 52A and the first switching valve 75 are used. May be omitted.
- the hydraulic oil is supplied to the exhaust valve drive unit 15 by sliding the second piston 35 ⁇ / b> A in a state where the hydraulic oil is stored in the first region in the storage chamber 30 in advance.
- the hydraulic oil in the exhaust valve drive unit 15 is returned to the first region.
- the flow direction of the hydraulic oil flowing out from the first region to the exhaust valve flow path 40 via the second opening 39 is selected as the exhaust valve drive unit 15 or the intake valve drive unit 81.
- a switching unit for switching automatically may be provided. In this case, when opening the exhaust valve 14, the switching unit is operated so that fuel is supplied to the exhaust valve driving unit 15. When opening the intake valve 80, the switching unit is operated so that fuel is supplied to the intake valve drive unit 81. According to this configuration, the third opening 82 and the intake flow path 83 can be omitted.
- the cross-sectional area of the first space 32 in the storage chamber 30 may be approximately the same as the cross-sectional area of the second space 33 or may be wider than the cross-sectional area of the second space 33. May be.
- the working fluid supplied to the first region and the second region in the storage chamber 30 may be a gas such as air.
- the working fluid that has flowed out from the first opening 37 may be supplied to the intake valve driving unit 81.
- the moving body equipped with the fluid supply system of the present invention may be a moving body other than a ship (for example, a heavy machine for construction) as long as it uses a diesel engine as a power source.
- the diesel engine to which fuel is supplied by the fluid supply system of the present invention may be a power generation engine.
- the fuel supplied to the injector 17 may be a fuel other than heavy oil (for example, light oil) as long as it is a fluid that burns naturally in the cylinder 12.
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Abstract
Description
以下、本発明の流体供給システムを、2サイクルのディーゼルエンジンに燃料を供給するためのシステムに具体化した第1の実施形態について、図1~図6に従って説明する。
次に、本発明の第2の実施形態を図7に従って説明する。第2の実施形態は、4サイクルのディーゼルエンジンに燃料を供給する点などが第1の実施形態と異なっている。以下の説明において、第1の実施形態と相違する部分について主に説明する。また、第1の実施形態と同一又は相当する部材構成には同一符号を付して、その説明を省略する。
次に、本発明の第3の実施形態を図8に従って説明する。第3の実施形態は、収容室30内の全ての領域に作動流体の一例としての燃料を供給する点が第1の実施形態と異なっている。以下の説明において、第1の実施形態と相違する部分について主に説明する。また、第1の実施形態と同一又は相当する部材構成には同一符号を付して、その説明を省略する。
次に、本発明の第4の実施形態を図9に従って説明する。第4の実施形態は、収容室30内に供給された燃料を、減圧して排気弁駆動部15に作動油として供給する点などが第3の実施形態と異なっている。以下の説明において、第3の実施形態と相違する部分について主に説明する。また、第3の実施形態と同一又は相当する部材構成には同一符号を付して、その説明を省略する。
次に、本発明の第5の実施形態を図10に従って説明する。第5の実施形態は、4サイクルのディーゼルエンジンに燃料を供給する点などが第4の実施形態と異なっている。以下の説明において、第4の実施形態と相違する部分について主に説明する。また、第4の実施形態と同一又は相当する部材構成には同一符号を付して、その説明を省略する。
Claims (15)
- 収容室を有する本体部と、
前記収容室内に配置され、第1方向又は該第1方向の反対方向である第2方向に移動する第1のピストンと、
前記収容室内において前記第1のピストンよりも前記2方向側に配置され、前記第1又は第2方向に移動する第2のピストンとを備え、
前記本体部には、第1の開口部と、第2の開口部とが設けられ、
前記第1のピストンを前記第1方向に移動させることによって、前記収容室内において前記1方向の端部に貯留された作動流体が、前記第1の開口部を介して前記収容室外に流出され、
前記第2のピストンを前記2方向に移動させることによって、前記収容室内において前記第2方向の端部に貯留された作動流体が、前記第2の開口部を介して前記収容室外に流出されることを特徴とする作動流体供給装置。 - 請求項1記載の作動流体供給装置において、
前記収容室は、前記第1方向側に位置する第1の空間と、前記第2方向側に位置する第2の空間とに区画され、前記第1の空間の前記第1又は前記第2方向に沿った断面積は、前記第2の空間の前記第1又は前記第2方向に沿った断面積よりも小さいことを特徴とする作動流体供給装置。 - 請求項2記載の作動流体供給装置において、
前記第1のピストンにおける前記第1方向側の端部は、前記収容室の前記第1の空間内に位置し、
前記第1のピストンにおける前記第2方向側の端部は、前記収容室の前記第2の空間内に位置しており、
前記第1のピストンにおける前記第1方向側の端部の表面積は、前記第2のピストンにおける第2方向側の端部の表面積よりも狭いことを特徴とする作動流体供給装置。 - 請求項3記載の作動流体供給装置において、
更に、前記第2のピストンを前記第1方向に付勢する付勢部材を備えることを特徴とする作動流体供給装置。 - 請求項2記載の作動流体供給装置において、
前記第1のピストンにおける前記第1方向側の端部及び前記第2方向側の端部は、前記収容室の前記第1の空間内に位置しており、
前記第2のピストンにおける前記第1方向側の端部は、前記収容室の前記第1の空間内に位置し、
前記第2のピストンにおける前記第2方向側の端部は、前記収容室の前記第2の空間内に位置しており、
前記第2のピストンにおける前記第2方向側の端部の表面積は、前記第2のピストンにおける第1方向側の端部の表面積よりも広いことを特徴とする作動流体供給装置。 - 請求項5記載の作動流体供給装置において、
更に、前記第2のピストンを前記第1方向に付勢する第1の付勢部材と、
前記第2のピストンを前記第2方向に付勢する第2の付勢部材と、を備え、
前記第2の付勢部材が前記第2のピストンに付与する付勢力は、前記第1の付勢部材が前記第2のピストンに付与する付勢力よりも弱いことを特徴とする作動流体供給装置。 - ディーゼルエンジンの気筒内に作動流体を燃料として供給するための流体供給システムであって、
請求項3又は4記載の作動流体供給装置と、
前記気筒内に燃料を噴射するインジェクタに、前記収容室から前記第1の開口部を介して流出した作動流体を導くための第1の流路と、
前記気筒内を排気するための排気弁を開閉する排気弁駆動部に、前記収容室から前記第2の開口部を介して流出した作動流体を導くための第2の流路と、
前記第1のピストン及び前記第2のピストンの移動を制御する制御装置と、を備え、
前記制御装置は、
前記インジェクタから作動流体を燃料として前記気筒内に噴射する場合、前記収容室内において前記第1方向の端部に作動流体を供給した後、前記第2のピストンを前記第1方向に移動させ、
前記排気弁を開く場合、前記収容室内において前記第2方向の端部に作動流体が貯留された状態で、前記第2のピストンを前記第2方向に移動させることを特徴とする流体供給システム。 - 請求項7記載の流体供給システムは、更に、
前記気筒内の吸気を行う吸気弁を開閉するための吸気弁駆動部に、前記作動流体供給装置から作動流体を導くための吸気用流路と、
前記収容室内において前記第2方向の端部に貯留された作動流体を、前記排気弁駆動部又は前記吸気弁駆動部に選択して供給する選択装置と
を備えることを特徴とする流体供給システム。 - 請求項7又は8記載の流体供給システムにおいて、
前記供給装置は、前記収容室内において前記第1方向の端部、前記収容室内において前記第2方向の端部、及び前記収容室内において前記第1のピストンと前記第2のピストンとの間に作動流体を供給可能であり、
前記制御装置は、
前記インジェクタから作動流体を燃料として前記気筒内に噴射する場合、前記収容室内において前記第1方向の端部に作動流体を供給した後、前記収容室内において前記第2方向の端部に作動流体を供給し、
前記排気弁を開く場合、前記収容室内において前記第2方向の端部に作動流体が貯留された状態で、前記収容室内において前記第1のピストンと前記第2のピストンとの間に作動流体を供給することを特徴とする流体供給システム。 - 請求項7又は8記載の流体供給システムは、更に、
前記第2のピストンを、前記第1方向又は前記第2方向に移動させるピストン駆動部を備えることを特徴とする流体供給システム。 - ディーゼルエンジンの気筒内に作動流体を燃料として供給するための流体供給システムであって、
請求項5又は6記載の作動流体供給装置と、
前記気筒内に燃料を噴射するインジェクタに、前記収容室から前記第1の開口部を介して流出した作動流体を導くための第1の流路と、
前記気筒内を排気するための排気弁を開閉する排気弁駆動部に、前記収容室から前記第2の開口部を介して流出した作動流体を導くための第2の流路と、
前記第1のピストン及び前記第2のピストンの移動を制御する制御装置と、を備え、
前記制御装置は、
前記インジェクタから作動流体を燃料として前記気筒内に噴射する場合、前記収容室内において前記第1方向の端部に作動流体を供給した後、前記第1のピストンを前記第1方向に移動させ、
前記排気弁を開く場合、前記収容室内において前記第2方向の端部に作動流体が貯留された状態で、前記第2のピストンを前記第2方向に移動させることを特徴とする流体供給システム。 - 請求項11記載の流体供給システムは、更に、
前記気筒内の吸気を行う吸気弁を開閉するための吸気弁駆動部に、前記作動流体供給装置から作動流体を導くための吸気用流路と、
前記収容室内において前記第2方向の端部に貯留された作動流体を、前記排気弁駆動部又は前記吸気弁駆動部に選択して供給する選択装置と
を備えることを特徴とする流体供給システム。 - 請求項11又は12記載の流体供給システムにおいて、
前記供給装置は、前記収容室内において前記第1方向の端部、前記収容室内において前記第2方向の端部、及び前記収容室内において前記第1のピストンと前記第2のピストンとの間に作動流体を供給可能であり、
前記制御装置は、
前記インジェクタから作動流体を燃料として前記気筒内に噴射する場合、前記収容室内において前記第1方向の端部に作動流体を供給した後、前記収容室内において前記第2方向の端部の作動流体圧を保持した上で、前記収容室内において前記第1のピストンと前記第2のピストンとの間に作動流体を供給し、
前記インジェクタへの作動流体の供給後に前記排気弁を開く場合、前記収容室内において前記第2方向の端部に作動流体が貯留された状態で、前記収容室内において前記第1のピストンと前記第2のピストンとの間に作動流体を供給することを特徴とする流体供給システム。 - 請求項11又は12記載の流体供給システムは、更に、
前記第1のピストンを、前記第1方向又は前記第2方向に移動させる第1のピストン駆動部と、
前記第2のピストンを、前記第1方向又は前記第2方向に移動させる第2のピストン駆動部とを備えることを特徴とする流体供給システム。 - 請求項9又は13記載の流体供給システムにおいて、
前記供給装置は、予め設定された規定量に定量された作動流体を、前記収容室内において前記第1方向の端部に供給する定量装置を有することを特徴とする流体供給システム。
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